Pen



FIG. 1 is a side elevation view of the pen of the present design;

FIG. 2 is an alternate side elevation view of the pen of FIG. 1;

FIG. 3 is a top plan view of the pen of FIG. 1;

FIG. 4 is an exploded side elevation view of the pen of FIG. 1;

FIG. 5 is a perspective view of the pen of FIG. 1 in closed condition; and,

FIG. 6 is an exploded perspective view of the pen of FIG. 1. 

CLAIM The ornamental design for the pen, as shown and described. 